Welding rod



March 28, 1939. SCHQENMAKER 2,152,286

WELDING ROD Filed Aug. 16, 1957 oxygen, and manganese or ferro-manganese. understood and readily carried into effect, I

which helps to protect the flowing hot metal drops Parts by weight frpm the action of the air. I

The main object of my invention is to provide #1 #2 an improved coating material of the above type. 20 In accordance with the present invention I use Fl 30 ag n materi l who e .e mposi n ti fi siiiiitjjjjIjjjjIjI'"::::::::::"::' .15 I 5 the following conditions: Qu 1. The ratio of the number of gram-molecules tfiitiaiigfisk'ittfiiitiffii39??121::- 3 of free S102 to the number of gram-molecules of siolfmm Watergless metal oxide which splits ofi oxygen and which is 25 derived, at least to 80% by weight, fr ir A small proportion of the higher oxide of iron lies between 3.5 and 1. may be replaced by other metal oxides by which 2. A quantity by weight of manganese or ferro- Oxygen is split such a t ta m diOXIde e Y manganese which is capable of combining with Eanese dioxide; and the like Which is known in all the oxygen susceptible of being split off. the Furthermore, pa t O t e e S Oz y 30.

40 rise to the production of a porous weld. Howto be construed as broadly as permissible in view 40 '45 suilicient content of lower oxide of metals of the $102, a metal oxide by which oxygen is split ofi,

e time it is possible to. obtain a weld which is at oxide by which oxygen is split 011 and which is 50 .55 thermos-a, welding rods provided with coating is susceptible 01' being split off, and (3) from Patented Mar. 28, 1939 t 2,l52,286 WELDDIG ROD Pieter Schoenmaker, Nijmegen, Netherlands, assignor to Willem Smit & Co's Transformatoreniabriek, Nijmegen, Netherlands Application August 16, 1937, Serial No. 159,392

- In the Netherlands November 4, 1936 4 Claims. (Cl. 219-8) My invention relates to coated welding rods, masses according. to the invention may be readily and more particularly to the use of organic submanufactured in mass production by the sostances with slag-forming coating materials concalled pressing or extrusion methods. taining free S102, a metal oxide which splits off In order that the invention may be clearly As is well known, the quality of electric arc shall describe the same in more detail with referwelds can be materially improved by using weldence to the accompanying drawing, in which the ing rods provided with slag-forming coatings, single figure is a plan view of a welding rod pro-' and various mixtures have been proposed for this vided with a coating according to the invention.

10 purpose. For instance, it has been proposed to The welding rod shown in the draw 10 use mixtures containing a metal oxide which prises a core I of welding material such as splits off oxygen during welding, and manganese steel, provided with a coating 2. In accordance or ferro-manganesa'and it has also been prowith the. invention the coating 2' may have, for posed to add an'organic substance to produce, example, the following two compositions:

15 during the welding, a reducing gas atmosphere 15 3. From 10% to 20% by weight of non-melting be replaced by SiOz in a combined state, for excarbohydrates. ample kaolin. When using organic substances, I am aware that the British patent specificasuch as w u and fi I prefer t e Pa y tion No. 425,443 dated July 13, 1933, discloses a a d at which v the oatin mas t 35 coating mass of the general type of the present proper consistency; for example dextrine is very 35 invention; however it contains only about 8% suitable f hi p rpose. by weight of a mixture of determi ed organic While I have described my invention with refsubstances. Furthermore, this patent states that erenee t0 specific examples, I do t W to be an excessive amount of organic substances gives i ed t t desire the app claims ever, I havefound that it is possible to use a of the Prior fairly high percentage by weight of a non-melt- What I claim is: ing carbohydrate, u s flour, p v ded are a 1. A slag-forming coating material for weld- "is taken to ensure that the slag produced has a ing rods comprising an organic substance, free type referred t abOVe under P n and manganese or ferro-manganese, said ma- I T a materials ccording to the in terial satisfying the following conditions (1) the V n i n may be ppl e a a c mp r tively thin ratio of the number of gram-molecules of free coating on the welding rod, while at the same $10: to the numberof gram-molecules of metal l as a r n as t e ro u w e s ng'any derived at least to by weight from iron, lying known coating material. B aus of t s, bigger between 3.5 and 1, (2) at least a quantity by metal drops may be obtained, which is of adweight of manganese or term-manganese whichvantaee in makin certa n types of welds. uris capable oicombiningwith all the oxygen-which to by weight of non-melting carbohydrates.

2. A slag-forming coating material for welding rods comprising free S102, a metal oxide by which oxygen is split of! and which is derived at least 80% by weight from iron, the ratio of the number of gram-molecules o! the SiO: to the number of gram-molecules of the metal oxide lying between 3.5 and 1, sufiicient manganese or ferromanganese' to combine with all the oxygen susceptible of being split 01!, and from 10% to 20% of non-melting carbohydrates.

3. A slag-forming coating material for welding rods comprising by weight 15 parts flour, 15 parts dextrine, 60 parts quartz, 105 parts higher oxide of iron (90%),,35 parts term-manganese (80% Mn), and 8.5 parts $102 from waterglass.

4. A slag-forming coating material for weldingrods comprising by weight, parts flour,

5 parts dextrine, parts quartz, 90 parts higher oxide of iron (90%), 35 parts term-manganese Mn), and 10.5 parts S102 from waterglass. 10

PIETER SCHOENMAKER. 

